DE426075C

DE426075C - Manufacture of hollow metal sealing rings

Info

Publication number: DE426075C
Application number: DEE31378D
Authority: DE
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-10-11
Filing date: 1924-10-11
Publication date: 1926-03-04

Description

Es sind bereits aus Metall, wie Blei ο. dgl., bestehende Dichtungsringe bekannt, die hohl ausgebildet sind und mit Graphit oder einem ähnlichen Schmiermittel ausgefüllt werden. Die Herstellung derartiger Dichtungsringe erfolgt gewöhnlich aus Rohren von kreisrundem Querschnitt in der Weise, daß das Rohr zuerst mit einer sein Zusammendrücken verhindernden Masse, wie Wachs o. dgl., gefülltThey are already made of metal, like lead ο. Like., Existing sealing rings known that are hollow are formed and filled with graphite or a similar lubricant. The production of such sealing rings usually takes place from tubes of circular Cross-section in such a way that the tube is first prevented from being compressed Mass, such as wax or the like, filled

ic und alsdann spiralig aufgewickelt wird. Die Spirale wird hierauf so aufgeschnitten, daß einzelne Ringe entstehen, die nunmehr durch Walzen und Pressen vierkantigen Querschnitt erhalten. Dieses bisher übliche Verfahren zuric and then wound up spirally. The spiral is then cut open so that Individual rings are created that now have a square cross-section through rolling and pressing obtain. This previously common method for

i_5 Herstellung solcher Ringe hat den Nachteil, daß, abgesehen von der Ungleichförmigkeit der Wandstärken, durch das Walzen der aufgeschnittenen Ringe an den Schnittstellen in radialer Richtung Querschnittsverringerungeni_5 Production of such rings has the disadvantage that, apart from the non-uniformity the wall thickness, by rolling the cut rings at the interfaces in radial direction cross-section reductions

so eintreten, so daß ein Teil der Ringe in der Nähe der aufgeschnittenen Stellen nach dem Walzen fortgeschnitten werden muß. Es ergeben sich hierbei sehr erhebliche Materialverluste, die gemäß der Erfindung dadurch vermieden werden, daß das Rohr vor dem Wickeln und dem Zerschneiden in Ringe bereits in eine flache Form gezogen wird, so daß die gewickelten Ringe über ihren ganzen Umfang genau den gleichen Querschnitt aufweisen. so enter so that part of the rings in the Must be cut away near the cut areas after rolling. It surrendered in this case very significant material losses, which are avoided according to the invention in that the pipe before the Wrapping and cutting into rings is already drawn into a flat shape, so that the wound rings have exactly the same cross-section over their entire circumference.

Die Zeichnung veranschaulicht eine beispielsweise Ausführungsform des Erfindungsgegenstandes, und zwar ist:The drawing illustrates an example embodiment of the subject matter of the invention, namely is:

Abb. ι ein Querschnitt durch ein Rohr, aus welchem ein Ring hergestellt wird.Fig. Ι a cross section through a tube from which a ring is made.

Abb. 2 zeigt die Form des Rohres nach dem erfolgten Flachziehen:Fig. 2 shows the shape of the tube after it has been drawn flat:

Abb. 3 und 4 sind Seitenansicht und Querschnitt durch einen fertigen Dichtungsring in einem etwas verkleinertem ,Maßstabe als die Abb. ι und 2.Figs. 3 and 4 are side and cross-sectional views of a finished sealing ring in FIG a somewhat reduced scale than Figs. ι and 2.

Die Herstellung der Dichtungsringe erfolgt in der üblichen Weise aus einem Rohr aus Blei oder einem ähnlich geeigneten Metall von rundem Querschnitt, wie er in Abb. 1 gezeigt ist. Das Rohr wird nun durch Ziehen auf einer Ziehbank in die in Abb. 2 gezeigte flache Form gezogen, nachdem es vorher mit einer Wachsmasse o. dgl. ausgefüllt war, die ein Zusammendrücken verhüten soll. Das Ziehen erfolgt in der üblichen Weise auf einer Ziehbank durch eine Ziehmatrize, deren lichte Weite der äußeren Form des in Abb. 2 gezeigten Rohres entspricht. Es ist aus Abb. 2 ersichtlich, daß der Querschnitt, den das Rohr nach dem Ziehen erhält, nicht zu einer wagerecht gelegten Achse symmetrisch liegt. Vielmehr setzt sich der Umriß des flachgezogenen Rohres aus zwei genau geraden einander parallelen Linien zusammen und zwei Kurven, die an der in der Abb. 2 oberen Seite buckeiförmig vorstehen und nach der unteren ■geraden Linie zu stärker abfallen. Das auf diese Weise flachgezogene Rohr wird um einen Dorn gewickelt, und zwar so, daß die in Abb. 2 gezeigte untere schmalere Fläche nach innen gelangt. Alsdann wird die so erhaltene Spirale an zwei einander gegenüberliegenden Stellen aufgeschnitten, so daß sich je zwei halbe Ringe ergeben. Jeder der beidenThe sealing rings are made in the usual way from a tube Lead or a similar suitable metal of round cross-section, as shown in Fig. 1 is. The pipe is now flat by pulling it on a drawbench Form drawn after it was previously filled with a wax compound or the like, the one Avoid squeezing. The drawing is done in the usual way on a draw bench by means of a drawing die, the inside diameter of which corresponds to the outer shape of that shown in Fig. 2 Rohres corresponds. It can be seen from Fig. 2 that the cross-section made by the pipe after pulling, is not symmetrical about a horizontal axis. Much more the outline of the flat-drawn tube is composed of two precisely straight lines parallel to each other and two curves, which protrude in the shape of a bucket on the upper side in Fig. 2 and towards the lower ■ straight line to slope more sharply. The pipe drawn flat in this way is turned around wound a mandrel, in such a way that the lower narrower surface shown in Fig. 2 got inside. Then the spiral obtained in this way is attached to two opposite one another Cut open places so that there are two half rings. Either of the two

Claims

half ring is now fitted with a pin on one side, which is also consists of a correspondingly weaker lead pipe drawn flat in the same way. The tube used for the pin is drawn so that the outer diameter corresponds to the inside diameter of the drawn outer tube is equivalent to. The pins are inserted in such a way that they are half in each of the two halves of the ring ίο protrude, however, as shown in Fig. 3 is, one half of the pin is slightly pointed so that it fits easily into the relevant ring halves. Those so prepared Rings are now placed on a mandrel, which exactly corresponds to the diameter of the spindle to be sealed, and A sleeve that corresponds to the inner diameter of the stuffing box is placed around this mandrel for which the rings are intended. Takes place between this sleeve and the mandrel now in a known manner the compression of the rings into that shown in Figs. 3 and 4 rectangular or square shape. During this pressing, the journal part that was not pointed, pressed tightly in the relevant ring half, so that each ring half a pin part fixedly contains, while the second pin part protruding from it in each case can engage in the corresponding opening of the second ring half to the mutual To secure the position of the ring halves.

The drawing of the ring into the special shape shown in Fig. 2 is therefore necessary, because when the flat ring is pressed into the rectangular shape, the material tends to migrate inward. Would so the cross-section to a horizontal median plane in Fig. 2 must then be symmetrical were due to the specified property of the metal when pressed on the inner ring side sharp edges arise, while relatively strong roundings remain on the outer ring circumference. By laying On the other hand, the mass on the outside results in a uniformly small rounding of the corners on the inside and expresses, as shown in Fig. 4 can be seen and how it appears desirable for the finished workpiece.

By avoiding a rolling process, apart from those already mentioned above Advantages of the more uniform wall thicknesses and the avoidance of waste, also considerable saves time, as the whole tube is drawn flat for a large number of rings done at once in a single pulling operation. Prevent the inserted tenons During assembly, the two halves of the ring fall apart, thereby making it easier the assembly.

The wax located therein is made from the finished sealing ring in a known manner o. The like. Removed by melting and the cavity is then with graphite or stuffed full of a similar lubricant. The pulling can of course also be done by a other operations with a similar effect can be replaced.

Godfather τ-An Proverbs:

I. Method of making hollow metal sealing rings of rectangular or square cross-section from tubes of circular cross-section by winding over a mandrel and cutting open the screw obtained into individual rings or ring parts, characterized in that that the tubes are first turned into a flat shape before winding by drawing or a similar working process with two parallel, flat surfaces lying axially in the case of the coiled rings brought and then the rings in a known manner by pressing between a mandrel and a sleeve surrounding it by means of punches acting in the axial direction of this mandrel on rectangular or square cross-section.

2. The method according to claim 1, characterized in that of the two parallel surfaces of the flattened tube, the surface resting against the mandrel when the screw is wound is narrower than the outer surface, i.e. the pipe cross-section is wider on the outside than on the inside.

3. The method according to claim r, characterized in that each of the Spiral formed half ring with one made of tubes by pulling

or the like to an outer shape corresponding to the inner shape of the flattened tubes brought pin is provided, the protruding part in the cavity of the associated second ring half and the prior to pressing the rings in the relevant Ring halves is inserted so that it can be pressed firmly into place with these united. no

1 sheet of drawings.